ad7755 Analog Devices, Inc., ad7755 Datasheet

ad7755

Manufacturer Part Number

ad7755

Description

Energy Metering Ic With Pulse Output

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD7755.pdf (16 pages)

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Download datasheet (249Kb)

U.S. Patents 5,745,323, 5,760,617, 5,862,069, 5,872,469.

V2N

V1N

V2P

V1P

REFERENCE

x1, x2, x8, x16

2.5V

PGA

SUPPLY MONITOR

REF

POWER

ADC

FUNCTIONAL BLOCK DIAGRAM

IN/OUT

...

AGND

CLKIN

110101

11011001

...

CLKOUT

CORRECTION

AD7755

...

PHASE

MULTIPLIER

SCF S0

GENERAL DESCRIPTION

The AD7755 is a high accuracy electrical energy measurement

IC. The part specifications surpass the accuracy requirements

as quoted in the IEC1036 standard. See Analog Devices’

Application Note AN-559 for a description of an IEC1036

watt-hour meter reference design.

The only analog circuitry used in the AD7755 is in the ADCs

and reference circuit. All other signal processing (e.g., multipli-

cation and filtering) is carried out in the digital domain. This

approach provides superior stability and accuracy over extremes

in environmental conditions and over time.

The AD7755 supplies average real power information on the

low frequency outputs F1 and F2. These logic outputs may be

used to directly drive an electromechanical counter or interface

to an MCU. The CF logic output gives instantaneous real power

information. This output is intended to be used for calibration

purposes, or interfacing to an MCU.

The AD7755 includes a power supply monitoring circuit on the

until the supply voltage on AV

below 4 V, the AD7755 will also be reset and no pulses will be

issued on F1, F2 and CF.

Internal phase matching circuitry ensures that the voltage and

current channels are phase matched whether the HPF in Chan-

nel 1 is on or off. An internal no-load threshold ensures that the

AD7755 does not exhibit any creep when there is no load.

The AD7755 is available in 24-lead DIP and SSOP packages.

AC/DC

DIGITAL-TO-FREQUENCY

HPF

supply pin. The AD7755 will remain in a reset condition

CONVERTER

REVP

LPF

PROCESSING

SIGNAL

BLOCK

DGND

Energy Metering IC

with Pulse Output

RESET

reaches 4 V. If the supply falls

AD7755

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